Hi Guys I'm new at thsi so bare with me. I have a C5 mark I from 2002. Petrol version. I'm loosing coolant and almost all of it. I did som work on it an discovered that it is leaking from on to the pipes going into the cabin. On the top pipe there is a small nut, or just a very small pipe, where it is flowing out. Does anyone know what it is for, and is something missing on it? I highpressure valve or tube or something? BR Bjarke